{"id":"1b01f981-1044-4b52-bc40-0c33ca9f2339","shortId":"2QHFfd","kind":"x402","title":"NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request.","tagline":"NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request.","description":"This endpoint serves NFT metadata for token ID 53 via the x402 payment protocol on the Base network. It accepts POST requests and returns JSON. Payment is settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe endpoint is part of a broader platform at lowpaymentfee.com that offers multiple pay-per-call APIs across categories including data analytics, AI/ML inference, finance/Web3, and infrastructure utilities, all priced uniformly at $0.02 per request. This specific endpoint (/api/v1/nfts/53/metadata) is focused on NFT metadata retrieval. The x402 challenge confirms the endpoint is live and accepting payments on Base mainnet.\n\nBecause there is no OpenAPI schema, no documentation beyond the landing page, and no example request/response payloads, the exact structure of the returned NFT metadata is unknown. Callers should expect a standard JSON metadata object (likely conforming to ERC-721 metadata conventions), but this is inferred rather than documented.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","json-response"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata","ERC-721 metadata","NFT info endpoint","on-chain NFT data","Base network NFT","x402 NFT API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","No example request or response payloads — metadata structure is unknown","Endpoint is scoped to a single NFT token ID (53); unclear if other token IDs are available at similar paths","Landing page lists many API categories but none link to docs; /api, /pricing, and /README pages all just show 'Connect wallet'"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/53/metadata","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/nfts/53/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and no documentation beyond a generic landing page. The specific NFT metadata structure is entirely unknown, making this effectively a stub 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'/api/v1/nfts/53/metadata':146 '/request':16,32 '0.02':15,31,78,140 '000':73 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':64 '20':72 '53':41 '6':83 'Base network NFT' 'ERC-721 metadata' 'NFT info endpoint' 'NFT metadata API' 'accept':52,162 'across':125 'ai/ml':130 'amount':70 'analyt':129 'api':86,124 'attach':95 'base':5,21,49,66,74,165 'base-network' 'beyond':175 'broader':113 'call':9,25,123 'caller':93,194 'categori':126 'challeng':155 'confirm':156 'conform':203 'contract':63 'convent':208 'data':128 'decim':84 'document':174,215 'endpoint':3,19,34,108,145,158 'equal':77 'erc':205 'exact':185 'exampl':181 'expect':196 'finance/web3':132 'focus':148 'header':100 'id':40 'includ':127 'infer':131,212 'infrastructur':134 'json':57,199 'json-response' 'key':87 'land':177 'like':202 'limit':90 'live':160 'lowpaymentfee.com':116 'mainnet':166 'maximum':69 'metadata':2,18,37,151,191,200,207 'multipl':119 'network':50 'nft':1,17,36,150,190 'nft-metadata' 'no-api-key' 'object':201 'offer':118 'on-chain NFT data' 'openapi':171 'page':178 'part':110 'pay':7,23,121 'pay-per-cal':6,22,120 'pay-per-call' 'payload':183 'payment':45,58,99,105,163 'per':8,24,79,122,141 'platform':114 'post':53 'price':137 'proof':106 'protocol':46 'rate':89 'rather':213 'request':54,80,142 'request/response':182 'requir':92 'retriev':152 'return':56,189 'schema':172 'serv':35 'settl':60 'simpli':94 'specif':144 'standard':198 'structur':186 'token':39 'token metadata' 'uniform':138 'unit':75 'unknown':193 'usdc':13,29,62,81 'usdc-settlement' 'use':82 'util':135 'valid':103 'via':10,26,42 'x':98 'x-payment':97 'x402':11,27,44,104,154 'x402 NFT API' 'x402-payment'","prices":[{"id":"dd78f3b0-c292-44c5-8706-f78cc1aa8423","listingId":"1b01f981-1044-4b52-bc40-0c33ca9f2339","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/nfts/53/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.532Z"}],"sources":[{"listingId":"1b01f981-1044-4b52-bc40-0c33ca9f2339","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/53/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.532Z","lastSeenAt":"2026-04-22T13:32:33.760Z"}],"details":{"listingId":"1b01f981-1044-4b52-bc40-0c33ca9f2339","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/53/metadata \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/53/metadata"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/53/metadata"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieve metadata for a specific NFT (token 53) programmatically","Integrate NFT metadata into a dApp or marketplace frontend","Agent-driven NFT data lookup with micropayment settlement"],"bestFor":["Developers needing pay-per-call NFT metadata without API key management","AI agents that can settle x402 payments on Base","Quick one-off NFT metadata lookups at low cost"],"notFor":["Bulk retrieval of metadata across many NFT collections (only serves token 53)","Users who need free or subscription-based access rather than per-call crypto payments","Querying NFT metadata on networks other than Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.627Z"},"updatedAt":"2026-04-22T13:32:33.760Z"}}